Micelle formation of 1-alkyl-3-methylimidazolium bromide ionic liquids in aqueous solution

Vanyúr, Rozália; Biczók, László; Miskolczy, Zsombor

doi:10.1016/j.colsurfa.2006.11.049

Cited by 285 publications

(205 citation statements)

References 30 publications

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“…The latter quantity corresponds to that reported for HONR bound to C 14 mim + micelle in the absence of NaCl. 30 The surroundings of HONR were also insensitive to NaCl concentration in SMs. On the basis of the derived E T (30) parameters we conclude that the environment around the probe in C 14 mim + micelle closely resembles that of diethylene glycol, whereas in SM the polarity is lower, and similar to that of dimethylformamide and acetonitrile.…”

Section: Resultsmentioning

confidence: 99%

“…Since the critical micelle concentration of C 14 mim + is 2.5 mM in neat water at 298 K, 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 SCX6 are 3.29, 4.91, and 12.5 in 0.1 M NaCl solution at 298 K, and they shift to lower value in the presence of organic cations. 37 Therefore, most of SCX6 hosts contain two phenolate moieties, and the macrocycle has 8 negative charges at pH 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 19 suspension is the large increase in the specific surface area of the partic...…”

Section: Discussionmentioning

confidence: 99%

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Reversible Nanoparticle–Micelle Transformation of Ionic Liquid–Sulfonatocalix[6]arene Aggregates

et al. 2015

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The effect of temperature and NaCl concentration variations on the self-assembly of 1-methyl-3-tetradecylimidazolium (C 14 mim + ) and 4-sulfonatocalix[6]arene (SCX6) was studied by dynamic light scattering and isothermal calorimetric methods at pH 7. Inclusion complex formation promoted the self-assembly to spherical nanoparticles (NP), which transformed to supramolecular micelles (SM) in the presence of NaCl. Highly reversible, temperatureresponsive behavior was observed, and the conditions of the NP−SM transition could be tuned by the alteration of C 14 mim + :SCX6 mixing ratio and NaCl concentration. The association to SM was always exothermic with enthalpy independent on the amount of NaCl.In contrast, NPs were produced in endothermic process at low temperature, and the enthalpy change became less favorable upon increase of NaCl concentration. The NP formation was accompanied by negative molar heat capacity change, which further diminished when NaCl concentration was raised.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Reversible Nanoparticle–Micelle Transformation of Ionic Liquid–Sulfonatocalix[6]arene Aggregates

et al. 2015

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“…1-Methyl-3-tetradecyl-imidazolium bromide (C 14 mim + Br  ) was prepared as described previously. 32 4-Sulfonatocalix [4]arene (SCX4) and 4-sulfonatocalix [8]arene (SCX8) (Acros Organics) comprised 1:9 and 1:21 stoichiometric amount of water in its crystal structure. 33 Their solutions were always neutralized by the minimum volume of concentrated NaOH.…”

Section: Methodsmentioning

confidence: 99%

Effect of Macrocycle Size on the Self-Assembly of Methylimidazolium Surfactant with Sulfonatocalix[n]arenes

et al. 2016

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The effect of macrocycle size on the association of supramolecular amphiphiles composed of 4-sulfonatocalix[n]arene and 1-methyl-3-tetradecylimidazolium (C 14 mim + ) was studied in aqueous solutions at pH 7. When the cavitand contained four sulfonatophenol units (SCX4), spherical nanoparticle (NP) formation was observed. In contrast, both supramolecular micelle (SM) and NP formation could be attained in the presence of NaCl when the larger, more flexible 4-sulfonatocalix[8]arene (SCX8) served as host compound. The SCX8-promoted self-assembly into SM was enthalpically more favorable than NP production but the molar heat capacity changes in the two processes barely differed. Addition of 50 mM NaCl significantly increased the enthalpy of C 14 mim + −SCX8 NP formation making thereby the self-organization into SM more favorable. The transformation of SM into NP at high temperature was due to the substantial entropic contribution to the driving force of NP formation. The critical micelle concentration and the local polarity in the headgroup domain were considerably lower for SM compared to those of C 14 mim + Br  conventional micelle.

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“…A number of researchers have investigated micelle formation in aqueous solutions of ILs. [2][3][4][5][6] To date, the aggregation behavior of imidazolium derivatives with variable chain lengths and mainly chloride and bromide anions has been presented. [2,5,7,8] Several methods for determining the critical Abstract: Some ionic liquids (ILs) are structurally analogous to surfactants, especially those that consist of a combination of organic and inorganic ions.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Critical Micelle Concentrations of Aqueous Solutions of Ionic Liquids and Other Ionic Surfactants

Preiss

Jungnickel

Thöming

et al. 2009

Chemistry A European J

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Some ionic liquids (ILs) are structurally analogous to surfactants, especially those that consist of a combination of organic and inorganic ions. The critical micelle concentration (CMC) is a basic parameter of surface chemistry and colloid science. A significant amount of research has already been carried out to determine the CMCs of ILs. However, because of the many varied cation/anion combinations, it is a daunting task to measure the CMCs of all possible ILs. Herein we suggest a general rule for predicting the CMCs of ionic surfactants in water based on data from COSMO-RS calculations. In accordance with the Stauff-Klevens rule, the molecular volume (V(m)) is sufficient to describe similar homologous series of cationic surfactants such as imidazolium- and ammonium-based ionic liquids with varying side-chain lengths. However, to also include anionic surfactants like Na[C(n)SO(4)] in a more general correlation, V(m) has to be exchanged by the cubed molecular radius (r3(m)) and the molecular surface has to be used as an additional descriptor. Furthermore, to describe double amphiphilic compounds like [C(4)MIm][C(8)SO(4)], the enthalpies of mixtures calculated by COSMO-RS have to be taken into account. The resulting equation had allowed us to predict the CMCs of all of the 36 tested surfactants with an error similar to or smaller than the usual experimental errors (18 different cations, 10 different anions: root mean squared error (rmse)=0.191 logarithmic units; R(2)=0.994). We discuss the factors governing micelle formation on the basis of our calculations and show that the structure of our equation can be related to Gibbs' theory of crystallization.

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Micelle formation of 1-alkyl-3-methylimidazolium bromide ionic liquids in aqueous solution

Cited by 285 publications

References 30 publications

Reversible Nanoparticle–Micelle Transformation of Ionic Liquid–Sulfonatocalix[6]arene Aggregates

Reversible Nanoparticle–Micelle Transformation of Ionic Liquid–Sulfonatocalix[6]arene Aggregates

Effect of Macrocycle Size on the Self-Assembly of Methylimidazolium Surfactant with Sulfonatocalix[n]arenes

Predicting the Critical Micelle Concentrations of Aqueous Solutions of Ionic Liquids and Other Ionic Surfactants

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